Gallery driving machine with roller pilot drill and relatively rotated outer drills



June 11, 1968 G. FISCHER ET GALLERY DRIVING MACHINE WITH ROLLER PILOT DRILL AND RELATIVELY ROTATED OUTER DRILLS 3 Sheets-Sheet 2 Filed March 7, 1966 June 11, 1968 G. FISCHER ET AL 3,33

GALLERY DRIVING MACHINE WITH ROLLER PILOT DRILL AND RELATIVELY ROTATED OUTER DRILLS 3 Sheets-Sheet 5 Filed March 7, 1966 o m ,,.........::..l.\ {I mhmwmw H H hwfl l whllk. .II I I 4 h l l wml LL I l I I I l I l l I l I I l I I l I l i .II I l l I l I 1 1| i r m 85% N 6w W f! I! Q 38:: an w 82% o. 25 v m rt 35 l r 5. 88 Q Q m Gt United States Patent 3,387,892 GALLERY DRIVING MACHINE WITH ROLLER PILOT DRILL AND RELATIVELY RGTATED OUTER DRILLS Georg Fischer and Heinz Petry, Rheinhausen, Germany,

assignors to Beteiligungsand Patentverwaltungsgesellschaft mit besehrankter Haitung, Essen, Germany Filed Mar. 7, 1966, Ser. No. 532,251 Claims priority, application Germany, Mar. 8, 1965, B so, 71 3 Claims. (Cl. 299-60) ABSTRACT OF THE DISCLOSURE A gallery driving machine for driving subterranean galleries, tunnels, mine shafts and the like, which includes a central roller drill for drilling an axial bore of a diameter considerably less than the diameter of the excavation to be driven, and also includes rotatable drum means arranged substantially coaxially with regard to said roller drill and supporting rotatable cutter means having their axes of rotation radially spaced from the axis of rotation of said roller drill, said drum means being fed axially in a direction toward the front of said roller drill by track laying means exclusively.

The present invention relates to a gallery driving machine for driving subterranean galleries, tunnels, mine shafts and the like, while employing a central auger as well as outer cutting tools. Machines of this type are known which by means of a rotating end-milling cutter drive an excavation with circular cross section while in the center of the gallery to be driven there remains a core. This excavation is then by means of likewise rotating cutting tools working in tangential direction widened to the desired gallery diameter. When driving galleries into hard rock, the drawback is encountered that the end-milling cutter becomes dull after a short time so that the gallery driving machine which is movable on a track laying driving mechanism has to be withdrawn in short intervals in order to permit an exchange of the cutter. Due to this frequent interruption and also in view of the fact that in order to extend the life of the end-milling cutter the feeding force must not be very high, only a slow driving of the above mentioned machines is possible.

With a further likewise heretofore known gallery driving machine which by means of an end-milling cutter drills a bore in the center of the gallery cross section, there exists the same disadvantage. In addition thereto, it is also disadvantageous that this machine rests by means of a complicated device on the timbering or walling of the driven gallery in order to be able to absorb the reaction forces which are encountered during the driving operation. Thus, with this machine an operation is not possible without timbering or walling, and in addition thereto, a special timbering and walling is a necessity.

Gallery driving machines have also become known which dig rock and gangue by employing roller drills. Machines of this type have to be pressed with considerably high force against the breast of the working. In order to make this possible, these machines rest counter to the driving direction on the timbering or walling for the gallery or directly on the natural wall of the gallery.

When such machines rest on the timbering of the gallery, such timbering must be sufficiently strong in order to be able to absorb the occurring high forces and to be able to convey these forces during the driving operation into the natural gallery wall. Such heavy timbering for the gallery is, of course, rather expensive. Moreover, it is difiicult to timber the gallery in this way Patented June 11, 1968 "Ice because if a continuous forward drive is to be assured, the timbering has to be effected during the driving operation. To this end, the individual timbering elements have to be transported in the driving direction past the support for the gallery driving machine and have to be connected to the respective forward end of the gallery to be timbered so that during the advance of the machine, the supporting elements always have available a completed timbering.

However, frequently a timbering of the gallery is not required. In such an instance, the machine rests on the natural wall of the gallery. This may be effected for instance by hydraulically operable mine props which engage excavations prepared in the wall. These excavations, however, weaken the arched structure or crown of the gallery wall so that these areas are subjected to the increased danger of a break.

It is, therefore, an object of the present invention to provide a gallery driving machine which will overcome the above mentioned drawbacks.

It is another object of this invention to provide a gallery driving machine which will make it possible to employ an anger of long life while on the other hand assuring that the total feeding force required for the driving operation will always be available without the necessity of taking special steps after the driving operation.

These and other objects and advantages of the invention will appear more clearly from the following specification in connection with the accompanying drawings, in which:

FIG. 1 diagrammatically illustrates a side view of a drilling mechanism of a gallery driving machine according to the present invention.

FIG. 2 shows a view of FIG. 1 as seen in the direction of the arrow II of FIG. 1, but on a smaller scale than that used in FIG. 1.

FIG. 3 is a side view similar to that of FIG. 1 of a modified gallery driving machine.

FIG. 4 is an end view as seen in the direction of the arrow IV of FIG. 3 but on a smaller scale than the latter.

The gallery driving machine according to the present invention is characterized primarily by employing a roller drill as anger and by furnishing the feeding force exclusively by a track laying mechanism supporting the body of the gallery driving machine. This arrangement permits the employment of an anger of long life while the total feeding force required for the driving operation will always be available following the driving operation without additional steps so that approximately the entire feed. ing force can be employed exclusively for driving the auger.

Referring more specifically to the drawings and FIGS. 1 and 2 thereof in particular, the arrangement shown in FIGS. 1 and 2 comprises a roller drill 1 which is driven by means of a shaft system 2 in such a way that said drill rotates about the extension of the axis of a driven gallery 3. In this way, a pre-dril-led bore 4 is driven. The drill rollers 5 of drill 1 are not driven. The pre-drilled bore 4 is stepwise widened to the desired gallery cross section by means of rotatable cutter heads 6, 7, 8, 9 which are connected to a drum 1i likewise rotatable about the axis of the gallery and pertaining to a gallery driving machine not further illustrated. In this connection, the cutting tools require only a very low feeding force.

According to the drilling device illustrated in FIGS. 3 and 4, a drum 12 rotatable about the axis of a gallery 11 supports cutting tools 13, 14, 15, 16 of a gallery driving machine (not further shown). These cutting tools broaden the pre-drilled bore 18 produced by a roller drill 17 to the desired cross section of the gallery. Roller drill 17 is driven by a shaft system 19 and is designed as a stepped drill. Drill rollers 20, provided with annular teeth and J offset relative to the tip of the roller drill in a direction opposite to the gallery driving direction, drill the predrilled hole 18. The diameter of hole 18 is greater than the diameter of the bore 22 which is produced by drill rollers 21 arranged at the tip of the drill.

The central pro-drills 1, 17 are with regard to their direction of rotation, speed and feed entirely independent of the movements of the respective drums and 12 associated therewith.

However, it is also possible fixedly to connect a pre-drill with a drum for the cutter tools so that the direction of rotation, speed and feed will be the same with both. If desired, the conditions of movement may be so selected that while the advance or feed for a central drill and for a drum is the same, the speed as well as the direction of rotation are different. In all instances, approximately the entire forward driving force produced by the track laying mechanism of the gallery driving machine acts upon the pre-drill.

It is, of course, to be understood that the present invention is, by no means, limited to the particular arrangements set forth above but also comprises any modifications within the scope of the appended claims.

What we claim is:

1. An excavation driving machine, especially for driving galleries, tunnels, and mine shafts, which includes a central roller drill for drilling an axial bore of a diameter considerably less than the diameter of the excavation to be driven, rotatable drum means arranged substantially coaxially with regard to said roller drill, rotatable cutter means supported by said drum means and having their axes of rotation radially spaced from the axis of rotation of said roller drill, and track laying driving means operable selectively and exclusively to axially feed said drum References Cited UNITED STATES PATENTS 1,333,491 3/1920 Hughes 299- X 2,758,825 8/1956 Wohlmeyer 29986 X 3,203,492 8/1965 Lichte -334 X FOREIGN PATENTS 124,898 1/1959 U.S.S.R.

ERNEST R. PURSER, Primary Examiner. 

